Design of automatic focusing fundus camera

A novel fundus imaging system is proposed. Gullstrand-Le Grand eye model is used to simulate normal human eye in imaging system, and parallel optical path is used to facilitate the combination of different functional components. The observation and aiming system of the traditional fundus camera is given away, and the automatic alignment system is added. The ring light source is used to eliminate corneal reflex. Through optimization design and simula- tion analysis of the imaging system,a fundus optcial system with great fabrication feasibility is designed. Results show that the modulation transfer function (MTF) values of all fields are higher than 0.3 at 130 lp/mm, the field curve is less than 0.2 mm and the distortion is less than 5%. The scheme can be applied to ophthalmic examination to promote the development of intelligent fundus examination and functional integration of fundus camera.